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Faszer, Yu.I. Davydov","submitted_at":"2011-04-19T04:09:23Z","abstract_excerpt":"We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST collaboration has measured $P_\\mu^\\pi \\xi$, where $P_\\mu^\\pi$ is the polarization of the muon in pion decay and $\\xi$ describes the intrinsic asymmetry in muon decay. We find $P_\\mu^\\pi \\xi = 1.00084 \\pm 0.00029\\,(\\textrm{stat.})_{-0.00063}^{+0.00165}\\,(\\textrm{syst.})$, in good agreement with the standard model prediction of $P_\\mu^\\pi=\\xi=1$. Our result is a factor of 7 more precise than the pre-TWIST value, setting new limits in left-right symmetric electroweak exte"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1104.3632","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2011-04-19T04:09:23Z","cross_cats_sorted":[],"title_canon_sha256":"da67edb3b7d5c9977e2b6fda5387d0415c1858aa1a8992f85f6f17e85859c684","abstract_canon_sha256":"b19863bc6656e2596b52a8a3a7f40fb985a4e5c6ec7625c3bf218aa3db4b62c2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:22:02.308116Z","signature_b64":"m9N2BgDD8ZkFu5IqSUzCjYvYXiWVVeXH9n8tpmJOP691OyqaUVbU77XHjKRWFhfp9p8gckN9ZwZfA+Gwq2deCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2eb80e3ae7c9259ab52bdc1ff0f0fee9ec423c64a3c47fdc1274772e6bba1366","last_reissued_at":"2026-05-18T02:22:02.307445Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:22:02.307445Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Precise measurement of parity violation in polarized muon decay","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. 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